TPS2373: DC Adapter and POE Power transition without failover

gorden tsai

Prodigy 210 points

Part Number: TPS2373

HI Sir:

Q1: Did any reference design for DC Adapter 30V and POE Power transition without failover?.

Q2;If APD Pin set to pull Low(POE Priority ) ,Does TPS2373 can working on DC Adapter 30V?,if can not ,any suggestion.

over 2 years ago

0 Michael Pahl over 2 years ago

TI__Mastermind 21320 points

Hello,

Please review this:

blog: https://e2e.ti.com/blogs_/b/powerhouse/posts/delivering-a-smooth-transition-from-ac-to-poe-power

training video: https://training.ti.com/designing-dual-input-poe-pd-systems-power-redundancy-smooth-transition-and-power-sharing

Reference Design: https://www.ti.com/tool/PMP20859

Note these materials cover two ports and an adapter, but you can implement the materials with a single port.

Additionally, the challenge will be the 30V adapter. You will need a wide-Vin design since most DCDC transformers are only made for standard PoE range 37V-57V. The transformer will be bigger and have a lower inductance.

We have some wide Vin designs I can share with you in private messenger if you can accept my connect request and tell me you output voltage/current requirements.

If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

Regards,

Michael P.

Applications Engineer

Texas Instruments

0 gorden tsai over 2 years ago

Prodigy 210 points

Thanks Michael:

1. I did take look title "Delivering a smooth transition from AC to POE power which is good for us ,but I could not find the reference design as that section,Would U please provide it?

2.About DCDC transformers that didn't problems for us,The transformers input range 27V~58V as we design.

3.Our output voltage is 12V@6A

Thanks

Gorden

0 Michael Pahl over 2 years ago in reply to gorden tsai

TI__Mastermind 21320 points

Hello,

1. Reference Design: https://www.ti.com/tool/PMP20859

2. A transformer that supports 72W output and a 27V-58V input is going to be very large and probably have thermal issues.

I would suggest using a buck-boost converter to boost your adapter voltage to 48V or 55V and then use it with the design I will send you in private messenger (please accept my connect request). Otherwise you will need to make a custom transformer, and I foresee it having the problems stated above.